Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbd3e509674b944…

MALICIOUS

PDF

69.6 KB Created: 2021-03-13 19:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d3e111cde48b2c07473e8dc459eea1ae SHA-1: 17caead0db4b6f7f364d69d6bb70a48831fb05dc SHA-256: 6cbd3e509674b9442adce3f1e8e8d93cd6a565a8f7bcedeb6bd1700f907a8b38
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=arabian+nights+movie+watch+online+free PDF link annotation
    • https://ziwolowuwuxux.weebly.com/uploads/1/3/5/3/135321756/begesulet.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/cOFFAaY/486961540.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/6252947.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/tge3bqB/vegetable_chopper_cutter_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/fgjjeB3/earth_day_art_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/jhbijig/61857429038.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/Lif6heC/spinach_dip_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/hewjhCP/16964436436.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/Amihjah/49438013978.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/bgdWggS/bekepajepikobinon.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/khgC9wy/game_sound_effects_library_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/jigeiiB/fexotig.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/igeihgg/sonnys_place_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_40cb9be2f63c4c5a852481ae99479a1a.pdf?index=trueIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_fef5476cf911428095a4c8971642649b.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_2789af0ea97b468b8810134fcd3eaa2b.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_f75f6d9ae3fa4043be1847b57f20e1b8.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_f6ff56d10a394b73bad7c1fd3ae55b75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/sports_nutrition_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/86538586763.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 5576 bytes
SHA-256: f7be6715026ff79b06ea50f055d24dcdcc1e29f7e154fd97f32dc46772af4fcb
font_01_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 10044 bytes
SHA-256: 9f69e4c99dafe82a52c5114001d8f3d96523c0c3d0520e730b289ec31758f5a9

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